package cn.tedu.auth.controller;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.concurrent.TimeUnit;
import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletResponse;

import cn.hutool.core.codec.Base64;
import cn.tedu.auth.domain.vo.Captcha;
import cn.tedu.common.component.CacheTemplate;
import cn.tedu.common.config.SystemConfig;
import cn.tedu.common.constant.CacheConstants;
import cn.tedu.common.constant.Constants;
import cn.tedu.common.model.RestResult;
import cn.tedu.common.model.RestResultUtils;
import cn.tedu.common.util.IdUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import com.google.code.kaptcha.Producer;


@RestController
public class CaptchaController
{
    @Resource(name = "captchaProducer")
    private Producer captchaProducer;

    @Resource(name = "captchaProducerMath")
    private Producer captchaProducerMath;

    @Autowired
    private CacheTemplate redisCache;

    /**
     * 生成验证码
     */
    @GetMapping("/captchaImage")
    public RestResult getCode(HttpServletResponse response) throws IOException {
        // 保存验证码信息
        String uuid = IdUtils.simpleUUID();
        String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + uuid;
        String capStr = null, code = null;
        BufferedImage image = null;
        // 生成验证码
        String captchaType = SystemConfig.getCaptchaType();
        if ("math".equals(captchaType))
        {
            String capText = captchaProducerMath.createText();
            capStr = capText.substring(0, capText.lastIndexOf("@"));
            code = capText.substring(capText.lastIndexOf("@") + 1);
            image = captchaProducerMath.createImage(capStr);
        }
        else if ("char".equals(captchaType))
        {
            capStr = code = captchaProducer.createText();
            image = captchaProducer.createImage(capStr);
        }

        redisCache.setCacheObject(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try
        {
            ImageIO.write(image, "jpg", os);
        }
        catch (IOException e)
        {
            return RestResultUtils.failed(e.getMessage());
        }
        Captcha captchaVO=new Captcha();
        captchaVO.setUuid(uuid);
        captchaVO.setImg(Base64.encode(os.toByteArray()));
        return RestResultUtils.success(captchaVO);
    }
}
